Drinking fountain arrangement and control valve therefor



March 21, 1967 B. TAYLOR 3,310,236

DRINKING FOUNTAIN ARRANGEMENT AND CONTROL VALVE THEREFOR Original Filed May 8, 1964 2 Sheets-Sheet l 5'71. 2 m -5 34i f 4# I g I 4 52 1 HI I 2? I Bl/BELEA T0 Den/N J 1 MT? QQQQGQ INVENTOR Acton 12. Tag Zar- ATTORNEYS V March 21, 1967 A. B. TAYLOR 3,310,236

DRINKING FOUNTAIN ARRANGEMENT AND CONTROL VALVE THEREFOR Original Filed May 8, 1964 2 Sheets-Sheet 2 INVENTOR Adm 19. TayZor BY 8% a rZ'wq/ ATTORNEYS United States Patent Office 3,316,236 Patented Mar. 21, 1967 3,310,236 DRHWKING FGUNTAIN ARRANGEMENT AND CONTROL VALVE THEREFOR Acton B. Taylor, 621 Clifi Drive, Newport Beach, Calif. 92660 Original application May 8, 1964, Ser. No. 365,932, new Patent No. 3,279,495, dated Oct. 18, 1966. Divided and this application Oct. 4, 1965, Ser. No. 492,620 9 Claims. (Cl. 239-29) This application is a division of my application Serial No. 365,932, filed May 8, 1964, now Patent No. 3,279,495.

This invention relates to drinking fountains of the general type having mechanical refrigerating means to cool the liquid being dispensed, and to an improved flow control valve especially designed for use with such drinking fountains.

Drinking fountains of the present type are in wide spread use for dispensing drinking water, and commonly include a cooling coil through which the water is passed before it is dispensed. conventionally, the inlet of the cooling coil is connected to a source of water'under'pressure, such as a water line, and the outlet of the coil is connected to the inlet of a pushbutton' type control valve. The drinking fountain also conventionally includes a bubbler head, which is connected to the outlet of the con trol valve, and a pan arranged so that when the pushbutton valve is operated, a water discharges from the bubbler head. Any water that flows into the pan is drained away.

Drinking fountains of the type described are commonly placed in oflice buildings and similar structures, as well as in outdoor locations. In extreme cold weather, the water within the coils of the cooling unit may unavoidably freeze, causing rupture of'the coil. In addition, the coils occasionally become damaged from other causes and leak or rupture. In either instance, because the inlet of the coil is connected directly to a water supply line, water can flow through the rupture in the coil and flood the immediate area of the drinking fountain. Such flooding is undesirable, especially in offices, where extensive damage can result to carpets, flooring, and the like. The drinking fountain arrangement of the present invention is designed to avoid this problem.

According to the present invention, a mechanical unit incorporating cooling coils is utilized, but' deviates from the conventional, in that the outlet of the cooling coil is directly connected to the bubbler head. Inaddition, the 7 control valve for the drinking fountain, instead of being placed between the outlet of the cooling coil and the bubbler head, is installed in advance of the inlet of they cations other than drinking fountains, and embodies several desirable features; For example, the flow con trolling elements of the valve are pre-assembled into a cartridge unit, which unit can easily be inserted and removed from a bore in the control valve body, thereby greatly facilitating servicing and repair. The present valve is also designed to prevent spurtingor surge flow; which is not only wasteful but annoying. Another fea-- ture of the valve is that it' is also provided with dual sealing surfaces to assure non-flow, and is constructed so that the pressurein'thes'upply line'urges theflow control element toward closed position, so that in the event of coil leakage or damage, flooding by continual flow through the coil is automatically and positively prevented. It is an object of the present invention to provide a drinking fountain of the type incorporating acooling unit, constructed in a manner to prevent extensive flooding of premises in the event (if leakage or rupture of the coil of the cooling unit. 1 Another object is to provide drinking fountain arrangement wherein, upon operation of the control valve thereof, flow through the bubbler head will begin slowly and continue at a substantially even pressure, thereby avoiding spurti'ng, surges, and water hammer.

It is also an object to provide a flow control valve for a drinking fountain constructed so that inlet fluid pressure will continually a'c't' surge thevalve toward a closed position" and to hold it closed until manually opened.

A further object is to provide a flow control valve wherein the flow controlling elements are assembled as a: cartridge unit that can be easily installed in and removed from the valve body'. a

Still another object is to provide a flow control valve incorporating dual sealing surfaces between an enlarged valve stem head portion and a valve seat, and between the valve seat opening and a mating tapered portion oft'he valve stem, so that a wiping action will occur upon each closing of the valve to clean the mating sealing surfaces. v

A still further object is to provide a flow control valve incorporating a flexible diaphragm, and constructed ,in amanner to minimize the possibility of damage to said diaphragm-from freezing of liquid within the valve.

Still another object is to provide a flow control valve, which allows an ample flow of liquid therethrough with a short valve stem stroke, and which can be readily ad justed to a desired flow rate.

Other objects and many of the attendant advantages of the present invention will be readily apparent from the following detailed description when taken in connection with the accompanying drawings, wherein:

FIG. 1 is a diagrammatic view of a drinking fountain and cooler assembly incorporating the flow control valve of the invention, and showing the relative arrangement of the control valve, the coolingunit, and the bubbler head;

FIG. 2 is an enlarged, vertical cross-sectional view through the control valve;

FIG. 3 is a fragmentary, horizontal, staggered crosss ectional view on a' reduced scale, taken along the line 3-3 of FIG. 2;

FIG. 4 is an elevational view, partially in cross-section, of the cartridge unit of the control valve; and

FIG. 5 is a schematic diagram showing the liquid cir' cuit arrangement of the cooler, and control valve and bubbler head of the drinking fountain assembly.

Referring now to the drawings, a conventional liquid cooler is indicated generally at 2 in FIG. 1, and includes a .front panel 4 to which isattached a drinking fountain assembly 6. While the liquid cooler 2 and the drinking fountain assembly 6 can be utilized to cool and dispense any one of a'numbe'r of liquids, they conventionally are employed to dispense water.

The liquid cbo1er'2 is'sh'own in diagrammatic form in- FIG. 1, and includes aj coolingcoil' 8 having an inlet 10' and an"ou'tlet'12 The drinking fountain assembly 6 comprises a" pan 14 having abowl portion 16 therein, from which extends a drain pipe 18. The pan 14 has a mounting flange 20 at its rear edge, and is secured to the front panel 4 of the liquid cooler 2' by' screws 22.

A bubbler head 24 is mounted on the basin 1 4 in position to discharge water into the bowl portion 16, and

8 includes a shield 26. A conduit 28 connects the bubbler head 24 with the outlet 12 of the cooling coil 8.

Also mounted on the pan 14 is a pushbutton operated flow control valve 30, to which is connected an inlet conduit 32 leading from a suitable source of water under pressure. An outlet conduit 34 connects the outlet of the valve 38 with the inlet of the cooling coil 8.

The construction of the control valve 30 is shown in detail in FIG. 2. This valve comprises a body 36 containing a replaceable cartridge unit 38 incorporating the principal working elements of the valve. A p-ushbutton 48 is positioned at the top of the control valve 30 and, when depressed, operates in a manner to be hereinafter described to open the control valve 30 to permit water to fiow therethrough to the cooling coil 8.

The valve body 36 has a cylindrical portion 42, and a reduced-in-diameter, externally threaded extension 44 at its upper end. A radial shoulder 46 is formed at the juncture of the threaded extension 44 and the cylindrical portion 42, and a pair of diametrically opposed, radially extending notches 48 is provided in the threaded extension 44.

In assembling the valve 30 with the pan 14, the threaded extension 44 of the valve body 36 is passed through a circular opening 50, in FIG. 2, in the pan 14. The opening '50 is provided on the periphery thereof with a radially inwardly projecting tab 52, dimensioned to be snugly received within one of the notches 48. The tab 52 and its mating notch 48 cooperate to prevent rotation of the valve body 36 relative to the pan 14. A hexagonal mounting nut 54 is threaded onto the projecting extension 44 of the valve body 36, and secures the valve body to the pan 14. As is best shown in FIG. 2, the axial thickness of the nut 54 is slightly greater than the distance that the extension 44 of the valve body 36 projects above the top surface of the pan 14.

The valve body 36 has an axial bore 56, which is threaded at 58 for about one-third of its length. A cylindrical inlet chamber 60 is provided in the lower end of the valve body 36, and is axially aligned with and opens into the bore 56. The diameter of the inlet chamber 60 is slightly less than one-third the diameter of the bore 56. A counterbore 62 surrounds the upper end of the inlet chamber 60, and its lower end forms an annular, rounded or concave groove 64, which defines a seat or sealing lip 66 that extends about the upper end of the inlet chamber 60 and which is also of a rounded, but convex cross-section.

The axial bore 56 has a bottom wall 68, from which a frusto-conical bore 70 extends inwardly and downwardly toward a flat annular shoulder 72 positioned at the upper end of the counterbore 62.

The valve body 36 also has a radial inlet port 74, which communicates with the inlet chamber 60 at a point about midway of the length thereof. The port '74 has an enlarged threaded outer end 76 to receive a fitting 78 which connects the water supply conduit 32 with the inlet chamber 60. The valve body 36 further has an axially directed outlet port 80, which opens at its upper end onto the bottom Wall 68 of the axial bore 56 and intersects the outer portion of the frusto-conical bore 70. The outlet port 80 terminates at its lower end in an enlarged, axially offset threaded portion 82, which receives a fitting 84 connected with the outlet conduit 34.

The cartridge unit 38, FIGS. 2 and 4, is received within the cylindrical bore 56, and comprises a lower body portion 86 and an upper body portion 88, both of which are cylindrical and of a like diameter slightly less than the diameter of the bore 56. The lower cartridge portion 86 terminates at its lower end in a radial end face 90, which has an annular recess 92 therein. A cylindrical boss 94 is positioned centrally of the end face 90 and projects downwardly therefrom. The boss 94 has a circular recess 96, within which is received an annular resilient neoprene valve seat 98. The valve seat 98 has an axial opening 100, and a thickness substantially greater than the length of the boss 94, whereby it projects a substantial distance therebelow. The lower, or outer, face 102 of the valve seat 28 is shown to have a slight inward and upward taper in FIG. 2. However, if desired, this taper can be eliminated, in which instance, the outer face of the valve seat would comprise a horizontal planar surface.

The lower cartridge portion 86 has a cylindrical bore 184 in the upper end thereof, defining a continuous rim 106, and a radial annular seat 108. An annular groove is provided in the seat 108 at the outer periphery thereof, adjacent the wall of the cylindrical bore 104. A frusto-conical wall 112 extends inwardly and downwardly from the annular seat 108, and terminates in a short cylindrical bore 114. The wall 112 defines, in part, an upwardly opening chamber 222. A horizontal dividing Wall 116 separates the bore 114 from the recess 96 in the boss 94. The wall 116 is provided centrally thereof with an inlet port 118 aligned with and of about the same diameter as the valve seat bore 108. Circumferentially spaced, angled ports 128 are provided at the juncture of the side wall of the bore 114 and the dividing wall 116, and the juncture of the outer surface of the boss 94 and the end face 98, said bores opening into the annular recess 92.

The upper cartridge portion 88 has a reduced-diameter cylindrical portion 122 at the lower end thereof, which is snugly received within the rim 106 on the lower cartridge portion 86 to retain said cartridge portions in axial alignment. The lower end of the upper cartridge portion 88 has a horizontal, annular clamping surface 124 thereon, and the upper face 126 of said upper cartridge portion is also horizontal and has a cylindrical upwardly projecting boss 128 centrally thereof. A frusto-conical wall 130 extends inwardly and upwardly from the annular clamping surface 124, and terminates in a bore 132 that extends through the boss 128. The wall 130 defines, in part, a downwardly opening chamber 224.

A circular, flexible diaphragm 134 rests on the annular seat 108, and a flat ring 136 rests on the outer marginal portion thereof. The outer diameter of the ring 136 is just slightly less than the diameter .of the bore 104, and the inner diameter thereof is slightly larger than the inner diameter of the annular seat 108. The annular clamp ing face 124 at the lower end of the cartridge portion 88 engages the top surface of the ring 136, and when the two cartridge portions 86 and 88 are urged toward each other, as explained hereinafter, the periphery of the diaphragm 134 is securely clamped in position. The groove 110 in'the seat 108 is provided to receive material displaced from the diaphragm 134 upon clamping thereof, and functions to prevent undue cold-flaw of the diaphragm material.

The diaphragm 134 is connected with a stainless steel valve stem 138 having a portion 140 that is disposed be low the diaphragm 134, extends through the inlet port 118 and through the opening 100 in the valve seat 98, and terminates in a cylindrical head portion 142. The diameter of the stem portion 140 is substantially less than the diameter of the inlet port 118 and the bore 100 in order to provide an annular flow path for water therebetween. By way of example, the inlet port 118 and the bore 100 may have a diameter of about 0.218 inch, in which instance the diameter of the valve stem portion 140 will be about 0.109 inch. The diameter of the head portion 142 is substantially less than the diameter of the inlet chamber 60. For example, the diameter of the inlet chamber 60 may be about 0.3125 inch and that of the portion 142 about 0.281 inch.

The upper side of the head portion 142 has an annular groove 144 that is generally triangular in radial cross-section, and defines a sealing lip 146 on the upper, outer periphery of said head portion 142. The sealing lip 146 is rounded or convex, and is engageable with the lower surface 102 of the valve seat 98. The inner wall of the groove 144 is formed by a frusto-conical stem portion 148, which tapers from an upper diameter substantially less than the diameter of the opening 100, to a diameter at the lower end thereof substantially greater than the diameter of said opening. Thus, as the valve stem 138 moves upwardly, the frusto-conical portion 148 will be wiped against the wall of the opening 100 in the valve seat 98, and said stem will come to rest with the stem portion 148 in sealing engagement with the lower portion of said opening. Such wiping action tends to remove any foreign matter from the frusto-conical portion 148 of the valve stem, and insures an effective seal between said portion and the valve seat 98.

In addition to the seal provided by the frusto-conical stem portion 48, a second seal is provided by the engagement of the sealing lip 146 with the lower surface of the valve seat 98. Thus, dual seals are provided to assure leakproof closure of the valve. It should be further noted that, as the valve seat 98 begins to wear, the frusto-c0ni cal stem portion 148 will still maintain an effective seal for a long period of time.

The length of the head portion 142, and the position of the inlet port 74 are such that when the head portion 142 is seated against the valve seat 98, the lower surface 150 thereof will be positioned in a plane above said inlet port. Thus, when the valve is closed, the inlet port 74 will be completely exposed. However, as the valve stem 138 is moved downwardly, as during opening of the valve, the length of the head portion 142 is such that it will progressively move across the radial inlet port 74, thus producing an obstruction and causing restriction in flow therethrough. The reverse action occurs during closing, at which time the head portion 142 is effective to prevent water hammer during closing of the valve. Hence this arrangement contributes significantly to the life of the valve components as well as to user satisfaction.

The portion 148 of the valve stem 138 has an integral collar 152 about midway of the length thereof, and a portion 154 of the valve stem projects above the collar 152 and is threaded and extends through an opening in the diaphragm 134. A combined diaphragm-supporting disk and not 156 is threaded on the stem portion 154 and is tightened against the collar 152, the lower face of said nut having a frusto-conical configuration. The upper surface 158 of the nut 156 engages the diaphragm 134, and is roughened to insure effective gripping thereof.

The threaded stem portion 154 has a clamping washer 168 thereon that engages the upper side of the diaphragm 134. A lock washer 162 is disposed on top of the clamping washer 168, and a retaining nut 164 is threaded on the stem portion 154 to secure the valve stem 138 to the diaphragm 13:4. The lower portion 166 of the retaining nut 164 is cylindrical, and terminates at its upper end in a radial flange 168. A reduced cylindrical head 1711 extends upwardly beyond the flange 168, and has a diametric slot 172 for receiving the tip of a screw driver or other suitable tool for installing the retaining nut.

The head 170 of the retaining nut 164 is received within a spring housing 174 comprising a cylindrical lower portion 176 having an external diameter slightly less than the diameter of the bore 132. The housing 174 is provided near its upper end with an intermediate enlarged portion 178 having an external diameter corresponding to that of the boss 128, and terminating at its upper end in a radial flange 180.

The spring housing 174 has a bore 182, the upper end 184 of which is threaded. T he bore 182 is slightly larger in diameter than the flange 168 of the retaining nut 164, and terminates at its lower end in an annular, radial shoulder 186 of an internal diameter less than the diameter of the flange 168. The flange 168 rests above the radial shoulder 186, and thus upward movement of the spring housing 174 will cause the valve stem 138 to likewise move upwardly.

A compression type range spring 188 is received inthe housing 174 with the lower end thereof surrounding the retaining nut head 170. A range adjusting screw 190 is received within the threaded :upper end 184 of the bore 182, and has a recess 192 in its lower face'for receiving the upper end of the spring 188. The range screw 1% has a slot 194 for receiving the tip of a screw driver. The resilient force of the range spring 188 can thus be adjusted by altering the position of the range screw 190 to vary the force urging the valve stem 138 downwardly away from the spring housing 17 4.

A return spring 196, under compression, extends be tween the upper end face 126 of the upper cartridge portion 88 and the lower face of the flange 180 on the spring housing 174, the upper and lower ends of said return spring 196 being held in position by the intermediate cylindrical portion 178 and the cylindrical boss 128, respectively.

The return spring 196 is thus operative to urge the spring housing 174 upwardly relative to the upper and lower cartridge portions 88 and 86, respectively. Such upward movement of the spring housing 174 causes the shoulder 186 to engage beneath the flange 168 on the retaining nut 164, which in turn causes the valve stem 138 to be moved upwardly until the head portion 142 thereof sealingly engages with the valve seat 98. The force of the return spring 196 is such that, when said spring is fully extended, it will hold the head portion 142 of the valve stem 138 in engagement with the valve seat 98 with just enough force to make a tight seal. Thus, no excessive clamping pressure, which might cause damage to the valve seat 98 is exerted by said spring. The range spring 188 is of less strength than the return spring 196, and thus the return spring 196, in effect, normally overrides said range spring to maintain the valve in a closed position.

The cartridge unit 38, as is best shown in FIG. 4, is self-contained, and can beeasily inserted and removed from the cylindrical .bore 56 in the valve body 36. The elements thereof are held in assembled relationship in part by the return spring 196, which urges the spring housing 174 away from the upper and lower cartridge portions 88 and 86, thus causing the radial shoulder 186 to engage the flange 168 and move the valve stem 138 so that the head portion 142 thereof is engaged with the valve seat 98. Because the valve stem 138 is thus urged by the spring housing 174 and is in engagement with .the valve seat 98, the components of the cartridge unit are effectively clamped together by spring pressure, thus making the cartridge unit 38 self-contained and easily removable. The cartridge unit 38 can, of course, be disassembled by first removing the range screw 1% and the range spring 188, and by'next removing the retaining nut 164. Upon removal of the nut 164, the valve stem 138, the spring housing 174, and the retaining spring 196 can be separated, after which the remaining elements of the cartridge unit can be easily disassembled without tools.

The cartridge 38, which contains the flow control elements of the valve 38, is received as a unit within the cylindrical bore 56 in the valve body 36; an O-ring seal 198 being positioned between the lower end face 98 of said cartridge and the bottom wall 68 of said bore.

The O-ring 198 has an external diameter corresponding to the diameter of the bore 56, and serves a dual purpose. First, it forms an effective seal to prevent leakage of fluid between the end of the cartridge unit 38 and the sidewall of the bore 56. Secondly, it spaces the lower end 98 of the lower cartridge portion 86 from the bottom wall 68 of the bore 56, whereby to define a manifold outlet chamber 2% therebetween for receiving flow from the angled outlet ports 120. While the ring 198 has been described as being an O-ring, it is to be understood that a flat fiber washer, or other suitable sealing member, could besubstituted therefor.

After the sealing ring 198 and the cartridge unit 38 have been inserted into the bore 56, a washer 202 is placed upon the upper face 126 of the upper cartridge portion 88, said washer having an external diameter slightly less than the diameter of the threaded portion of the bore 56, and having a radially projecting tab 2%, FIG. 3, which is receivable in one of the notches 48. A retainer nut 206, FIG. 2, is then threaded into the bore 53, and tightened to clamp the sealing ring 198 in position, and to clamp the outer margin of the diaphragm 134 securely between the upper and lower cartridge portions 83 and 86, respectively. The retainer nut 206 has a plurality of circumferentially spaced holes 208 for receiving the pins of a suitable spanner wrench (not shown). The length of said nut 206 is such that when the cartridge unit 38 has been securely tightened in position, a substantial portion thereof will project above the upper end of the valve body 36 and the mounting nut 54.

The pushbutton 40 comprises a cup-shaped body portion 210, which receives the flange 186 on the spring housing 174. The pushbutton 4t terminates at its lower end in an outturned flange 212. A screw thimble 214- has an opening 215 to receive the pushbutton 40, and an inturned flange 216 that overlies and is normally spaced from the flange 212. The screw thirnble 214 has hexagonal, external wrench-engaging surfaces 218, and internal threads 220 that cooperate with the projecting portion of the retainer nut 2% to secure the pushbutton 40 in operative position on the valve 30.

The operation of the valve 30 is as follows: with the inlet conduit 32 connected to a source of water under pressure, the return spring we will normally urge the spring housing 174- and the valve stem 138 upwardly, whereby to seat the valve stem head portion 142 on the valve seat 198. Because the head 142 is completely exposed within the inlet chamber 60, the pressure of the water entering said chamber from the conduit 32 will exert force on said head, tending to cause it to more tightly engage the valve seat 9%. The pressure will also urge the tapered stem portion 148 to form a second seal with the wall of the seat opening 1%. Thus, the greater the pressure of the incoming water, the more effective will be the seal between the head portion 142 and the valve seat 98, and the stem portion 148 and the passage 100. The use of inlet pressure to cause sealing engagement, coupled with the dual sealing feature of the valve 30, effectively insures that no water leakage can occur through the closed valve.

When it is desired to open the valve 3 the pushbutton dtl is manually depressed against the force of the return spring 196. As the pushbutton 40 is depressed, the spring housing 174 will move downwardly, thus disengaging the radial shoulder 186 from the flange 1%. This frees the valve stem 138 for downward movement. Accordingly, as movement of the housing 174 continues, the range spring 188 will be compressed between the range screw 190 and the nut flange 168, until the force thereof is suflicient to overcome the pressure being exerted on the valve stem head portion 142 by water contained in the inlet chamber 60. Continued downward movement of the pushbutton 4-0 will then cause the valve stem 148 to move downwardly, thus unseating the head portion 142 and permitting flow from the inlet chamber 60, through the seat opening 100, the inlet port 118, and into the chamber 222 below the diaphragm 134. The water will then flow through the angled outlet ports 120 into the outlet chamber Ztltl, then through the outlet port 8% and the conduit 34, into the cooling coil 8, for discharge through the bubbler head 24. It should be noted that as the stem head 142 moves downwardly, flow through the inlet port 74 will be progressively restricted in the manner hereinabove described.

When it is desired to stop flow through the valve, the pushbutton 49 is merely released. The return spring 1% then causes the spring housing 174 to move upwardly relative to the upper cartridge portion 88. As the spring housing 174 moves upwardly, the radial shoulder 186 will be brought into engagement with the flange 168, and thereafter the valve stem 138 will move upwardly with the spring housing 174. When the pushbutton 49 has returned to its original position, the return spring 1% will have caused the head 142 to again seat on the valve seat 98, thereby closing the valve. Water pressure within the inlet chamber on will then again function to keep the head 142 tightly seated. During closing action of the valve, the restriction of the flow through the inlet port '74 caused by the head 142 will gradually decrease and the tapered stem portion 148 will gradually restrict flow through the seat opening 160, whereby flow will be effectively controlled to prevent water hammer.

After the valve has closed, all flow ceases and such water as is present in the system between the valve 343 and the bubbler head 24 remains there, since the system is airtight. It will also be appreciated that with the coil 29 located at a height above the bubbler head as shown in FIG. 1, if the coil develops a leak, air entering at such point will break the vacuum and water can drain from the coil into the pan 14 through the bubbler head.

It will be noted that one feature of the present control valve is that an ample amount of flow can be obtained with a relatively short stroke of the valve stem 138. Further, the positioning of the angled outlet ports 12% at the lower end of the cylindrical bore 114 insures that even if the diaphragm 134- should move completely downwardly into engagement with the frusto-conical wall 112, flow through the valve will not ,be closed off.

Another feature of the valve is that it is designed so that no damage can be caused by Water freezing in the valve body. The amount of water which can be retained within the lower diaphragm chamber 222 is relatively small, but even if water contained therein should freeze, the upper diaphragm chamber 224 provides ample room for the diaphragm 134 to expand. Also any water that might freeze in the chamber 69 could expand Without causing damage because of the yieldability of the seat 98. It should also be noted that, because the valve seat 98 and the valve stem head portion 142 are disposed on the inlet side of the diaphragm 134, a leak in the diaphragm will not be exposed to inlet fluid pressure except when the valve is open. Thus, accidental flooding because of a leaky diaphragm is eliminated.

As has been hereinabove mentioned, the control valve 30 in the drinking fountain arrangement of the invention is positioned on the inlet side of the cooling coil 8. This arrangement insures that if a leak should occur in the cooling coil 8, either because of rupture from freezing or for any other reason, the maximum amount of leakage than can occur will be limited to the liquid that can leak out of the cooling coil. Thus, a serious accidental flooding of the premises where the drinking fountain is located is avoided. If the coil 8 should become ruptured, this fact would normally become readily apparent immediately upon opening of the valve 39, and the valve could then he closed to prevent any further flooding.

The positioning of the valve 30 at the inlet of the cooling coil 8 also provides another desirable result. Frequently, in drinking fountains where the control valve is connected adjacent the bubbler head, upon actuation of the control valve, a sudden gush or spurt of water will result. This is frequently annoying to the user of the fountain, and often causes waste and unnecessary splashing of water onto the floor. In the present invention, the control valve 30 is positioned at the inlet to the coil 8, so that water must first flow through the coil 8 before reaching the bubbler head 24. The result is that the first discharge of water from the bubbler head after depressing the pushbutton 40 will not be a surge, but rather will be a relatively gentle flow. As a result, splashing is avoided.

The control valve of the invention also functions to regulate the rate *of flow through the cooling coils 8.

9 When the valve 30 is in an open position, the range spring 188 will cooperate with the inlet water pressure in the chamber 60 to move the valve stern 138 away from the valve seat 98, or permit it to move toward said seat, as fluctuation in inlet pressure occu'rs. This regulating action insures that a relatively constant pressure will be present in the coil 8, as well as in the water issuing from the bubbler head 24. The pressure of such outflow through the bubbler head 24 can be controlled by merely adjusting the range screw 190 which, in turn, adjusts the force of the range spring 188. In addition, the range spring 188 will yield and permit the stem head 142 to move toward the seat 98 under surge conditions, or upon sudden depression of the pushbutton 40', to thus automatic'ally maintain a uniform flow rate to the bubbler head 24.

L1 addition, the range spring 188 will yield and permit the stem head 142 to move toward the seat 98 under surge conditions, or upon sudden depression of the pushbutton 40, to thus automatically maintain a uniform flow rate to the bubbler head 24,

I claim:

1. In combination: a liquid cooler including a cooling coil having an inlet and an outlet; a bubbler head connected directly with the outlet of said cooling coil, said cooling coil being arranged in a plane above that of said bubbler head; whereby in the event of coil rupture, at least the liquid in the cooling coil beyond said rupture can drain by gravity through said bubbler head; and a manually operable valvecontrolling the flow of liquid to said cooling coil and bubbler head, having an inlet connectable to a source of liquid under pressure and having an outlet connected with the inlet of said cooling coil.

2. In combination: a liquid cooler including a cooling unit having an inlet and an outlet; a bubbler head connected directly with the outlet of said cooling unit, said cooling unit being arranged in' a plane above that of said bubbler head, whereby in the event of coil rupture, at least the liquid in the cooling unit beyond said rupture can drain by gravity through said bubbler head; a manually operable valve controlling the flow of liquid to said cooling unit and bubbler head, having an inlet connectable to a source of liquid under pressure and an outlet connected with the inlet of said cooling unit, said valve having a valve seat positioned between said valve inlet and said valve outlet, a valve stem having a head portion that is engageable with said valve seat to prevent flow therethrough, said headportion being disposed between,

said valve inlet and said valve seat and thus being subjected to the liquid underpressure entering said valve through said valve inlet to urge said head portion into sealing engagement with said valve'seat to automatically prevent liquid flow to said coo-ling unit when said head portion is seated, and means connected with said valve stem -for moving said head portion away from said valve seat to open said valve.

3. The combination recited in claim 2, wherein the means connected with the valve stem includes pushbutton means operable to move said head portion away from said valve seat, said pushbutton means comprising means arranged to automatically regulate the movement of the head portion relative to the valve seat in response to fluctuations in inlet pressure, whereby to establish a generally constant outlet liquid pressure.

4. In combination: a liquid cooler including a cooling unit having an inlet and an outlet for liquid to be cooled; a bubbler head connected directly to the outlet of. said cooling unit, said cooling unit being arranged in a plane above that of said bubbler head, whereby in the event of cooling unit rupture, at least the liquid in the cooling unit beyond said rupture can drain by gravity through said bubbler head; and a valve for controlling flow of liquid to said bubbler head, said valve including a body having an inlet connectable with a source of liquid under pressure, an outlet connected with the inlet of said cooling unit, and a valve seat having an opening establishing communication between said inlet and said outlet, said valve further including a valve stemdisposed in said valve body and having a head p'oftion disposed between said valve seat and said inlet and engageable with said valve seat to prevent flow through said valve; a pushbutton; and resilient means cooperable with said pushbutton and said valve stem arranged so that when the pushbutton is depressed, said head portion is moved away from said valve seat to open said valve to permit liquid flow to said cooling unit.

5. The combination recited in claim 4 wherein the resilient means includes a first resilient member disposed between the pushbutton and stem and'arra'nged to urge apart said pushbutton and said stemand a second resilient member disposed between said pushbutton and an abutment in said valve body arranged to urge said pushbutton away from the stem.

6. In combination: a liquid cooler including a cooling coil' having an inlet and an outlet; a bubbler head connected directly to the outlet of said cooling coil, said cooling coil being arranged in a plane above that of said bubbler head, whereby in the event of coil rupture, at least the liquid in the cooling coil beyond said rupture can drain by gravity through said bubbler head; a manually operable valve controlling the flow of liquid to said bubbler head including a housing having an inlet connectab'le to a source of liquid under pressure and an outlet connected with the inlet of said cooling coil, said housing having a bore between said inlet and outlet; and a replaceable cartridge unit removably mounted in the bore in said housing, said unit including an upper body portion having a downwardly-facing open chamber; a lower body portion having an upwardly-facing chamber disposed in confronting relation with said downwardly-facing chamher; a diaphragm positioned between said upper and lower body portions separating said chambers from each other; annular valve seat means on said lower body portion having an axial opening communicating with said upwardlyfacing chamber and arranged to be placed in communication with said valve inlet, said lower body portion also having a port leading from said upwardly-facing chamber to and communicating with said valve outlet; a valve stem connected with said diaphragm and including a portion extending through said valve seat opening and having a head on the lower end thereof exteriorly of said lower body portion engageable with said valve seat, said valve inlet including a chamber in which said stern head is received; means continually urging said valve stem in a direction to engage said head with said seat; and means operable to move said valve stem in the opposite direction to move saidhead portion of said valve stem away from said valve seat to permit flow from said valve inlet to said upwardly-facing chamber, and through said port to said valve outlet and thence to the inlet of said cooling coil.

7. In combination: a liquid cooler including a cooling coil having an inlet and an outlet; a bubbler head connected directly with the outlet of said cooling coil, said cooling coil being arranged in a plane above that of said bubbler head, whereby in the event of coil rupture, at least the liquid in the cooling coil beyond said rupture can drain by gravity through said bubbler head; and a manually operable valve controlling the flow of liquid to said cooling coil for subsequent discharge from said bubbler head, said valve having an inlet connectable to a source of liquid under pressure and having an outlet conabove that of said bubbler head, whereby in the event of coil rupture, at least the liquid in the cooling coil beyond said rupture can drain by gravity through said bubbler head; a manually operable valve controlling the flow of liquid to the inlet of said cooling coil, said valve having an inlet connectable to a source of liquid under pressure and an outlet connected with the inlet of said cooling coil, said valve having a valve seat positioned between said valve inlet and said valve outlet, a valve stem having a head portion that is engageable with said valve seat to prevent flow therethrough, said head portion being disposed between said valve inlet and said valve seat and thus being subjected to the liquid under pressure entering said valve through said valve inlet to urge said head portion into sealing engagement with said valve seat to automatically prevent liquid flow to said cooling coil when said head portion is seated, and means including a manually operable pushbutton connected with said valve stem for moving said head portion away from said valve seat to open said valve upon depression of said pushbutton and for automatically returning said head portion into engagement with said seat upon release of said pushbutton.

9. In combination: a liquid cooler including a cooling coil having an inlet and an outlet; a bubbler head connected directly to the outlet of said cooling coil, said cooling coil being arranged in a plane above that of said bubbler head, whereby in the event of coil rupture, at least the liquid in the cooling coil beyond said rupture can drain by gravity through said bubbler head; a manually operable valve controlling the flow of liquid to said bubbler head including a housing having an inlet connectable to a source of liquid under pressure and an outlet connected with the inlet of said cooling coil, said housing having a bore between said inlet and outlet; and replaceable cartridge unit removably mounted in the bore in said housing, said unit including an upper body portion having a downwardly-facing open chamber; a lower body portion having an upwardly-facing chamber disposed in confronting relation with said downwardly-facing chamber; a flexible, circular diaphragm having an outer marginal portion positioned between said upper and lower body portions separating said chambers from communication with each other; annular valve seat means on said lower body portion having an axial opening communicating with said upwardly-facing chamber and arranged to be placed in communication with said valve inlet, said lower body portion also having a port leading from said upwardly-facing chamber to and communicating with said valve outlet; a valve stem having an upper end extending through and being connected with said diaphragm and including a portion extending through said valve seat opening and having a head on the lower end thereof exteriorly of said lower body portion engageable with said valve seat, said valve inlet including a chamber in which said stern head is received; means continually urging said valve stem in a di rection to engage said head with said seat; and means operable to move said valve stem in the opposite direction to move said head portion of said valve stem away from said valve seat to permit flow from said valve inlet to said upwardly-facing chamber, and through said port to said valve outlet and thence to the inlet of said cooling coil.

References Cited by the Examiner UNITED STATES PATENTS 735,295 8/1903 Price 62398 1,793,292 2/1931 Taylor 137-495 1,918,131 7/1933 Ranstead 62-399 1,959,366 5/1934 Kellogg 23929 2,022,787 12/1935 Smith -l 62393 2,370,390 2/ 1945 Berryman 62304 3,148,700 9/1964 Friedell 137454.5 3,166,500 1/1965 Noakes 137454.6

EVERETT W. KIRBY, Primary Examiner. 

1. IN COMBINATION: A LIQUID COOLER INCLUDING A COOLING COIL HAVING AN INLET AND AN OUTLET; A BUBBLER HEAD CONNECTED DIRECTLY WITH THE OUTLET OF SAID COOLING COIL, SAID COOLING COIL BEING ARRANGED IN A PLANE ABOVE THAT OF SAID BUBBLER HEAD; WHEREBY IN THE EVENT OF COIL RUPTURE, AT LEAST THE LIQUID IN THE COOLING COIL BEYOND SAID RUPTURE CAN DRAIN BY GRAVITY THROUGH SAID BUBBLE HEAD; AND A MANUALLY OPERABLE VALVE CONTROLLING THE FLOW OF LIQUID TO SAID COOLING COIL AND BUBBLER HEAD, HAVING AN INLET CONNECTABLE TO A SOURCE OF LIQUID UNDER PRESSURE AND HAVING AN OUTLET CONNECTED WITH THE INLET OF SAID COOLING COIL. 